burnett



(No Model.)

H. 1). BURNETT.& s. E. 110mm.

ELEGTRIGINGANDESGENTLAMP.

Patented July 4, 1893,

' "EMWEMTQ rinnarf pl MAssAoIiUs'n'r NEW YORK.

di LYNN, AND. shaman L p ,N A SSIGNORS To run GENERAL ELEGTRIQ inmnr, or

"ELEcTmc"iNcANoEsoENT LAMP.

sracrsxcerron forming part of Letters Patent we. co e 49, dated July 4, 1893.

Application filed October 28, 1892. Serial No.450,237. (Remodel-l To all whom it may concern..- v

Be it known that we, HENRY'D. BURNETT, residing at Lynn, and SAMUEL E. DOANE, residing at Swampscottfln the county of Essex, 5 State of Massachusetts, have invented a certain new and useful Improvement in.Incandescent Lamps, of which the following is a specification.

In the manufacture of incandescent lamps as commonly practiced at the present time, there. are two principal ways by which the incandescing conductor is fastened to the leading-in. wires; by a deposit t carbon fronia hydro-carbon fluid, and by a paste composit tion usually composed mainly of carbon. It has been customary in the latter method to attach the filament simply by adhesion of the paste to a round wire. We have, however, experienced difficulty in making paste joints in this way especially when using'a filament composed partly of deposited carbon, as the spring of the filament is such that its ends tend to move away from the leading-in wires toward the outer surface of the paste globule, therebyinterposing a greater or less portion of the joint between thefilament and leading-in conductor. This we propose to obvi- "ate by making use of a specially shaped wire, which on its side next the filament hasa longitudinal groove or recessinto which the ends of. the filament are sprung Sothat the elasticity of the filameptimay be utilized in holding itagainst the wire, the paste securing it in position. We also, prefer that this supporting wire be separate from the leading-in wires passing through and sealed into the globe, and somewhat stouter, so that a firm support is'secured for the filament, the sup porting wires being electrically connected 0 with the platinum leading-in wires and being sealed into the stem of the globe though not passing through the glass. p

In the accompanying drawings Figure 1 showslin section and side view a number of supporting wires falling within our invention i butdi'fierent'in shape and arrangement. Figs.

2,3, 4 and -5 show in'section portions of a 'j .ment and support ng conduetorgfor each end lamp with the filament attached to supporti'ngwires similar that seen in'FigrL; Fig. 6

-5oshowssimilarly a lamp provided with ,two'

' larly recessed.

filaments in series, and Figs. 7 and 8 show sections on line w- -a' of Figs. 2 and 6. In these views A represents the glass globe or bulb of the lamp which may be of any desired pattern. 5 5

I B, B are the wires leading to the lamp and O is the filament.

Platinum leading-in wires are shown at D and to these are connected the stouter supporting wires E to which the ends of the fila: 6o ment are respectively attached.

In order that the elasticity of the filament maybe utilized to hold it closely against the supporting wires the latter are variously shaped as seen in Fig. 1, so as to form on the 6 side next the filament an indeutatiomgroove or recess a to receive theend of the filament. The exact shape of this groove isimmaterial but suitable forms are sfien at b,c and d, and the same result is secured at eand f byar- 7o ranging two or more wires or a single. wire bent double so as to provide the necessary indentation. 1 J In Fig. 6 two filaments C, C. are shown which are electrically in series, and each of 7 which has one terminal supported by a separate conductor of the kind previously de-- scribed, while their remaining ends, are se cured to a support 0 having two branches simir In making the lamps the supporting wires are fixed in position: The filament is then sprung into place with its endsjlocated in the indentations in the sides of the supporting wires, and the joint is then completed by applying a globule of ,paste' H uniting the two together. I I

What we claim as new, and desire to secure by Letters Patent, is-= 1. In an incandescent electric lamp a iila go ment and conductor supporting its ends consi'stihgof wires of a grooved 0r indented sec- -tion; whereby the ends of the filament may be seated in grooves or notches-therein and be held in place byits own elasticity, as set f0rth. r A

2. In, an incandescent electric lampta filaof thefilament; each consistingofi two or more to form longitudinal open sided grooves or recesses to receive the ends of the filament.

3. In an incandescent electric lamp a filament and supporting wires longitudinally grooved or recessed throughout on their sides opposite the ends of the filament, in which recesses the filament ends are seated, and car- .bon paste uniting the wires and filament, as

set forth.

' 4. In an incandescent electric lamp a filament and comparatively stout conducting wires fastened to the globe but not passing through it, which-wires are so shaped as to form longitudinal open sided recesses or grooves to receive the ends of the filament and hold it in place by its own elasticity.

5. In an incandescent electric lamp two pairs of filament supports, one pair being insulated and the other connected electrically so as to allow of two ormore filaments being used in a single bulb, thesupports having longitudinal grooves on their sides so that the filament can be held in place by its own elasticity, as set forth.

In testimony whereof we have hereto set our hands this 25th of October, 1892.

HENRY D. BURNETT. SAMUEL E. DOANE.

Witnesses:

JOHN W. GIBBONEY, BENJAMIN B. HULL. 

